Guidebooks

South Sister
44.3131° N, 71.3185° W
Updated 09/07/2025Route Details
A great line. South Sister is the most reliable line in Castle Ravine. This line differs from North and Middle because it’s wider and less defined. While the other sisters have condition dependent cruxes, South Sister is usually skiable most years. Pick through bushes at the very top, gaining an open chute a little similar to GOS Main. Ski steep and sustained turns to where South Sister merges with the runout of Middle/North Sister.